|Publication number||US5671955 A|
|Application number||US 08/489,106|
|Publication date||Sep 30, 1997|
|Filing date||Jun 9, 1995|
|Priority date||Jun 9, 1995|
|Publication number||08489106, 489106, US 5671955 A, US 5671955A, US-A-5671955, US5671955 A, US5671955A|
|Inventors||Paul W. Shumway|
|Original Assignee||American Fence Corporation|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (34), Referenced by (19), Classifications (6), Legal Events (9)|
|External Links: USPTO, USPTO Assignment, Espacenet|
1. Related Applications
This application is related to my prior application, Ser. No. 08/397,920 filed Mar. 3, 1995, titled THREADLESS PIPE COUPLER.
2. Background of the Invention
This invention pertains to piping systems utilizing threadless coupling, in general, and to threadless couplers for building fire sprinkler systems, in particular.
Pipe sections which must be joined together to form a run of pipe for the flow of fluids therein must be free from leakage. Considerable care must be employed in selecting fittings which will properly form joints or couple adjacent sections of pipe. In addition, the fittings must securely fit and grip the pipe in a straight and leak free relationship.
These problems are particularly apparent in pipe runs which are utilized in building fire sprinkler systems. In these applications, the joined sections of pipe must be straight and aligned to prevent twisting and longitudinal separation.
It is desirable to provide an arrangement wherein pipe connections can be accomplished quickly and at relatively low cost.
Several arrangements have been proposed in the past to provide coupling arrangements. For example, in U.S. Pat. No. 4,304,424, an arrangement is described in which plain ends of pipe are connected with a coupler having a cutting member which penetrates the surface of the pipe.
It has been found that this is not a desirable coupler and therefore, it is one object of this invention to provide an improved coupler which easily and quickly connects adjacent pipe ends in an end to end or confronting relationship along a straight line.
It is another object of the present invention to provide a coupler wherein conventional tooling may be used to aid in the installation process.
A coupler in accordance with the principles of this invention comprises a generally cylindrical body which receives the ends of the pipes to be coupled.
The ends of the pipes to be coupled each have a circumferential groove formed on the exterior surface.
The coupler includes at each pipe receiving end an internal circumferential groove which carries a split locking spring or lock ring. Each circumferential groove receiving a locking spring in the coupler has its sidewalls inclined to the interior surface of the pipe. The circumferential groves in the coupler are of such a depth so that the locking spring may be forced into the groove so that a pipe then can pass over the locking spring. The locking spring is preformed such that when the corresponding rectangular groove in the pipe end is in alignment with the locking spring, the locking spring will engage the groove on the pipe as well as a portion of the groove on the coupler to prevent longitudinal separation of the pipe. After the pipes and coupler are assembled, the locking ring will engage a sidewall of the pipe groove as well as a sidewall of the coupler groove to limit axial movement of the pipe relative to the coupler. With both sidewalls of the groove in the coupler inclined, axial movement between the pipe and coupler in either direction results in a camming or wedging action of the lock ring.
The coupler also includes seals which are each carried in an internal circumferential groove spaced inwardly from each locking spring. Each seal provides a fluid tight seal with the end of the pipe.
With this arrangement, pipe ends may be quickly snap connected together to provide a highly reliable and quick installation of a fire sprinkler system.
The invention will be better understood from a reading of the following detailed description taken in conjunction with the drawings in which:
FIG. 1 illustrates a coupler in accordance with the principles of the invention utilized to connect together two pipes;
FIG. 2 is a cross section of the coupler of FIG. 1 with one pipe in cross section inserted into the coupler and a second pipe positioned for insertion into the coupler;
FIG. 3 illustrates a lock ring;
FIGS. 4 and 5 illustrate in enlarged cross section a portion of the coupler and an inserted pipe; and
FIGS.. 6 and 7 show in cross section alternate grooves which may be utilized on pipe assembled with the connector of the invention.
Turning now to FIGS. 1 and 2, a quick connect pipe connector 1 for connecting two pipes together end to end in-line is shown.
Cold formed into the inner surface 10a at each end of the cylinder 10 is a shaped circumferential groove 13. Formed in each groove 13 is an aperture 14. A split locking spring or split lock ring 12 is carried in each of the grooves 13. The lock ring 12 shown in FIG. 3 has an "at-rest" diameter chosen such that a portion of the lock ring will lie within the groove 13 and a portion of the lock ring 12 will extend out of the groove 13. The lock ring 12 includes arms 12a which are captured in and extend through the aperture 14. When a pipe is to be inserted into the coupler 1, the arms 12a are forced apart in order to urge the lock ring 12 into circumferential engagement with the bottom of the groove 13. The depth of the groove 13 is such that when the lock ring 12 is so spread, the lock ring 12 will be recessed into the groove 13 such that a pipe may be inserted into the coupler 1.
Spaced inwardly of each groove 13 is a groove 23 which is also cold formed into the interior surface 10a. Each groove 23 is of generally semicircular cross section. Assembled into the semicircular grooves 23 are "O" ring seals 11. The "O" ring seals 11 may be of conventional material. Each "O" ring seal 11 is of such a cross sectional diameter that it will extend into the interior of the cylinder 10 above the surface 10a.
As shown in FIG. 2, pipes 20 and 21 may be coupled together by the coupler 1. Each of the pipes 20 and 21 includes a circumferential groove 33 on its outer surface. Each groove 33 is cold formed onto the pipe utilizing conventional commercially available tools. Each of the grooves 33 is of comparable depth and width to the grooves 13 carried on the interior of the pipe coupler 1. As shown in FIG. 2, when a pipe 20 is inserted into the coupler 1, the locking spring 12 engages a circumferential groove 33 on the pipe. In addition, each "O" ring seal 11 will engage the circumference of pipe 20 at the end section of the pipe 20. "O" ring seal 11 deforms, thereby forming a fluid tight circumferential seal between pipe 20 and coupler 1. During insertion of the pipe 20 into the coupler 1, the arms 12a are moved such that the spring 12 rests in groove 13. Pipe 20 can then pass over the locking spring 12. The arms 12a are released and locking spring 12 will ride on the external surface of pipe 20 until groove 23 comes into alignment with the locking ring 12. At that time, the lock ring 12 will snap into a rest position in groove 13 on the pipe coupler 1 and groove 33 on pipe 20. Because the lock ring 12 extends radially into groove 13 as well as groove 33, the lock spring 12 will prevent any significant axial movement of the pipe 20 relative to the coupler 1. With both pipes inserted into coupler 1, the pipes will be connected together in a fluid tight connection.
Turning now to FIGS. 4 and 5, the operation of the lock ring 12 in conjunction with the circumferential groove 13 on the coupler 1 and the circumferential groove 33 on pipe 20 or 21 is shown. FIGS. 4 and 5 show in greater detail the upper left hand portion of the pipe coupler 1 shown in FIG. 2. With the pipe 20 fully inserted into the pipe coupler 1, the lock ring 12 is captured between circumferential groove 33 of the pipe and circumferential groove 13 in the pipe coupler 1. The groove 13 is shaped such that its sidewalls 13a and 13b are inclined relative to inner wall 10a of the coupler 1, they form ramps or cam surfaces form ramps along which the lock ring 12 will be carried. As clearly shown in FIG. 4, movement of the pipe 20 to the left relative to the coupler 1 will cause the lock ring 12 to engage the ramp wall 13a of groove 13 and sidewall 33b of groove 33. Because of the inclined surface or ramp shape of the sidewall 13a, a camming or wedging or locking action occurs with any axial force tending to separate the pipe 20 from the coupler 10. Likewise, as shown in FIG. 5, the surface 13b of groove 13 and the surface 33a of groove 33 likewise engage the lock ring 12. Any axial force in a direction to drive the pipe further into the coupler 1 results in a camming or wedging or locking action of the lock ring 12 against the surfaces 13b and 33a. Additional axial forces in the same direction will only act to drive the lock ring 12 in cam like fashion into locking engagement between the surfaces 13b and 33a.
Although in FIGS. 4 and 5 the pipe groove 33 is shown as having ramp like sidewalls, the circumferential groove in pipe 20 may have other shapes such as shown in FIGS. 6 and 7. In FIG. 6, the sidewalls of the circumferential groove 33 are substantially perpendicular to the bottom of the groove. In FIG. 7, the circumferential groove 33 is of generally arcuate or semicircular shape.
Advantageously in the embodiment of the invention shown in the drawings, the lock ring 12 is of circular cross section.
In a sprinkler system utilizing the coupler 1 to connect sprinkler pipe, the coupler 1 provides for a fluid tight connection between sprinkler pipes. With this arrangement, very limited axial movement between the pipe and the coupler can occur. With axial movement of the pipe relative in either direction to the coupler, a camming or wedging action occurs regardless of which axial direction the pipe moves.
Advantageously, the lock rings 12 and the "O" rings 11 are carried by and internal to the coupler. This is particularly advantageous since it is unnecessary for the pipe fitter to assemble either "O" rings or lock rings onto a pipe end before connection as is required in prior fittings. The pipes to be connected require no special tooling and are merely cut to the appropriate length and a groove 33 is cold formed onto the external surface of the pipe.
This arrangement enables sprinkler piping systems to be rapidly assembled and to provide a secure leak tight fitting.
In the illustrative embodiment of the invention, the piping used for the fire sprinkler pipe is a thin walled pipe such as described in my U.S. Pat. No. 5,131,697 issued Jul. 21, 1992 and assigned to a common Assignee.
It should be apparent that the illustrative embodiment of the pipe coupler shown is for connecting two pipes in line. The principles of this invention can easily be applied to other types of connectors such as a "T" connector or multiple pipe connectors or elbows or end caps or any of the conventional pipe coupling shapes which are widely known.
It will be apparent to those skilled in the art that various changes may be made to the structures shown and described herein without departing from the spirit or scope of this invention. It is my intention that such other embodiments be covered by the claims of this invention and that I be limited only by the scope of the claims which are appended hereto.
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|U.S. Classification||285/305, 285/321|
|Cooperative Classification||A62C35/68, F16L37/088|
|Jun 9, 1995||AS||Assignment|
Owner name: AMERICAN FENCE CORPORATION, ARIZONA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SHUMWAY, PAUL W.;REEL/FRAME:007573/0851
Effective date: 19950609
|Oct 7, 1999||AS||Assignment|
Owner name: ALLIED TUBE & CONDUIT CORPORATION, ILLINOIS
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:AMERICAN FENCE CORPORATION;REEL/FRAME:010281/0978
Effective date: 19990908
|Mar 7, 2001||FPAY||Fee payment|
Year of fee payment: 4
|Mar 30, 2005||FPAY||Fee payment|
Year of fee payment: 8
|Mar 30, 2009||FPAY||Fee payment|
Year of fee payment: 12
|Dec 23, 2010||AS||Assignment|
Owner name: UBS AG STAMFORD BRANCH, CONNECTICUT
Free format text: ABL NOTICE AND CONFIRMATION OF GRANT OF SECURITY INTEREST IN PATENTS;ASSIGNOR:ALLIED TUBE & CONDUITCORPORATION;REEL/FRAME:025562/0221
Effective date: 20101222
|Dec 29, 2010||AS||Assignment|
Owner name: WILMINGTON TRUST FSB, CONNECTICUT
Free format text: NOTE NOTICE AND CONFIRMATION OF GRANT OF SECURITY INTEREST IN PATENTS;ASSIGNOR:ALLIED TUBE & CONDUIT CORPORATION;REEL/FRAME:025571/0387
Effective date: 20101222
|Apr 9, 2014||AS||Assignment|
Owner name: ALLIED TUBE & CONDUIT CORPORATION, ILLINOIS
Free format text: TERMINATION AND RELEASE OF SECURITY INTERST IN PATENTS;ASSIGNOR:WILMINGTON TRUST, NATIONAL ASSOCIATION, SUCCESSOR IN INTEREST TO WILMINGTON TRUST FSB;REEL/FRAME:032644/0054
Effective date: 20140409
|Apr 15, 2014||AS||Assignment|
Owner name: DEUTSCHE BANK AG, NEW YORK BRANCH, NEW YORK
Free format text: NOTICE AND CONFIRMATION OF GRANT OF SECURITY INTEREST IN PATENTS (SECOND LIEN);ASSIGNOR:ALLIED TUBE& CONDUIT CORPORATION;REEL/FRAME:032689/0253
Effective date: 20140409
Owner name: DEUTSCHE BANK AG, NEW YORK BRANCH, NEW YORK
Free format text: NOTICE AND CONFIRMATION OF GRANT OF SECURITY INTEREST IN PATENTS (FIRST LIEN);ASSIGNOR:ALLIED TUBE & CONDUIT CORPORATION;REEL/FRAME:032688/0542
Effective date: 20140409